Downloaded zip files. Accidentally tried to "open with" windows photo viewer. All zip files changed. Can't find what program to use as default for the zip files now. Tried several that were listed with in "open with", but didn't work, and when I browsed, I didn't know what to try. Can anyone help? I have checked out the control panel default settings, but I don't know which one to use to bring back the zip files, so I can extract them.